android-first-line/chapter03/src/main/java/pers/tanyong/chapter03/RelativeLayout.java
package pers.tanyong.chapter03;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class RelativeLayout extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_relative_layout);
    }
}